For the love of all that is rightous, somebody help me here.

I have been using GS 6.3.4(?) commercial for ages now, and, quite suddenly, the following problem has occured.

Whenever I try to run a level, any level, the "Loading name.wdl" meter begins, and after about four dots, it just stops, then the engine locks up (I have to ctrl-alt-del to move again.)

I have tried rerunning the level
I have tried rebuilding the level
I have tried restarting the PC
I have tried the previous three steps in various combinations
I have reinstalled Gamestudio
I have reinstalled the newest patch (6.3.4?)
I have tried loading oter levels, but to no avail

By the by, Sed won't start either. If I ctrl-alt-del, it is in the task section, about five items down or so.

I have an Athlon 1 gig with Win 98 SE.

Any help here?